MAGNETIC BASE SIGHT TO FIT RIBS FROM .230" TO .330" (15/64-21/64; 5.8MM-8.3MM) 2 RED, 2 GREEN LITEPIPES. FITS BERETTA 686 AND 687 W/ULTRA NARROW RIB,AL390,AL391 URIKA, A391 XTREMA, BROWNING GOLD,BPS,CITORI 28GA AND .410,BENELLI:SBE, MI FIELD, NOVA; REMINGTON:ALL FIELD MODELS, FRANCHI:ALL FIELD MODELS, CHARLES DALY:ALL FIELD MODELS, VERONA:ALL FIELD MODELS, RUGER, RED LABEL FIELD GUNS.